I have OMV installed on XCP-ng, so rolling back to my previous version isn't a problem. I just did the update out of curiosity.
The System, Services and Diagnostics sidebar items seem to work properly in the web interface. However, the Network, User Management and Storage to not display their tabs. The sidebar items expand to show their child items, but the content of the main window does not change accordingly.
While doing the recent update, my system "kept back" from installing linux-image-5.10.0-8-amd64 5.10.46-2 and linux-image-amd64 5.10.46-2.
I'm logged in as admin.
I've got a snapshot in case anyone wants to play, but I'm rolling back now.
Hope this is useful.